Since fruits are available year around in the tropics not like in temperate climate some butterflies have evolved to feed on rotting fruits.So why these butterflies prefer fruit juice over nectar? It has been experimentally shown that Sodium and other microbial products such as Amino Acids are deficient in nectar ,where as fruits are richer in Sodium and Nitrogen . So the next question is , are these butterflies interested in both Sodium and Nitrogen equally or more interested in one over the other.

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